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I heard moissanite could look just like a diamond. How can I tell them apart?
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Answer: Moissanite is a synthetic gem material with properties that differ from those of diamond. An experienced gemologist will be able to distinguish between diamond and synthetic moissanite. If there is any doubt, the stone can be sent to a qualified independent laboratory for identification.
Synthetic moissanite has the following physical properties: refractive index 2.648-2.691, birefringence 0.043, specific gravity 3.22 (it will float in methylene iodide — S.G. 3.32), dispersion 0.104, and hardness 9.25. Under magnification, look for the following characteristics: doubling in appearance of facet junctions, whitish or reflective needles, rounded facet junctions, surface pits, or polish lines.
For more information on how to distinguish synthetic moissanite from diamond, you can read the following article on our website:
Simple Ways to Distinguish Synthetic Moissanite from Diamond
GIA also published a very comprehensive article about synthetic moissanite in our journal, Gems & Gemology, in the Winter 1997 issue. The article, "Synthetic Moissanite: A New Diamond Substitute" discusses our research and findings regarding the properties and identification of synthetic moissanite. To order this issue, you can use our online order form. You can also order by telephone (800) 421-7250, extension 7142, or e-mail: dortiz@gia.edu.
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